Control apparatus for a loom



April 1, 1969 Filed June I5, 1966 v. svATY ET AL CONTROL APPARATUS FOR ALOOM l Sheet of 4 Ul *U1 @Us REVERSE' HAGA/ET mi sa s,

Aprill, 1969 v. svATYr ET Al. 3,435,854

CONTROL APPARATUS FOR A LOOM Filed June 5,1966 sheet 3 @f4 sc P l r ol.-1 1F-J1 sie MOTOR April 1, 1969 Filed June 5, 1966 svATY' ET AL-CONTROL APPARATUS FOR A LOOM United States Patent U.S. Cl. 139-1 10Claims ABSTRACT F THE DISCLOSURE The control circuit of a loom isoperated by a pushbutton start switch, a pushbutton stop switch, and apushbutton reverse switch by which electrically operated parts of theloom are connected with a higher voltage at the beginning of certainoperations, and with a lower voltage during normal operation of theloom.

Various methods of starting and stopping looms are known. The oldestones use levers and mechanical transmissions or possibly pushbuttons, bymeans of which the electric motor of the loom is started and stopped.Only Ithe more recent methods use a pushbutton control in connectionwith an effective clutch and a brake mounted in the machine. None of thedevices hitherto known fulfills all the following requirements of theweaving technology while maintaining simultaneously the required`simplicity of the construction.

The involved technological requirements are the following:

Starting the machine during one revolution.

Very fast stoppage of the machine in the case of malfunction of the weftinserter.

Machine stoppage in the threading position upon the signal of the warpstop motion.

Machine stoppage upon weft yarn breakage in the same shed and followingreturn of the batten to the rear dead centre, in which replacement ofthe missing weft thread is possible.

Machine starting from one position (rear dead centre) of the Ibatten, inorder to maintain the `llection of the reed, caused by the dynamicforces acting upon starting of the reed always on the same value.

Possibility of turning the machine manually as well as by a motor whichis necessary for the adjustment of lthe position of the loom.Possibility of turning the machine manually as well as by a motor evenif the warp stop motion is open (in the case warp being slack with outbreakage). Possibility of turning the machine fo:- ward one revolutioneven in the case of open weft stop motion (for the eventuality ofdividing the web).

All the said required functions are accomplished bv the presentinvention which relates `to looms, the clutch and the brake of which areelectromagnetically controlled. The present invention provides anelectric circuit with pushbutton switches START, STOP and RE- VERSE, bymeans of which, upon pushing one or two of them, loom starting `andstopping, turning for one revolution, returning the batten to the reardead centre and manual as well as turning of the loom by a motor can beachieved. Turning the loom for one revolution forwards is achieved bypushing button START, followed immediately by pushing button STOP andholding the latter down until the loom is stopped. By pushing buttonSTART, the weft and warp stop motion circuits `are disconnected andbrought out of action, this enabling to turn the machine even when saidstop motions are open, however, preventing the machine from beingstarted with the weft inserter ice in an incorrect position, said weftinserter being controlled by its own stop motions. Moreover, thiselectrical arrangement can assure after an impulse from the known weftchecking device, stopping of the loom, even :before the beat-up, thebatten being returned to the rear dead centre by means of pushbuttonREVERSE Where the weft can be replaced. At the time at which theelectric motor is not running up, the warp and weft stop motion circuitsare out of action, this enabling to turn the machine manually foradusting even an empty loom. The electric circuit of the deviceaccording to the present invention is connected with two voltages, thehigher of which being in action only during the time of starting themachine, i.e. during pushing down the pushbutton START or during theaction of the REVERSE switch for the reversed motion of the loom. Thelower voltage is fed to the circuit only during the normal run of themachine, i.e. after releasing the -pushbutton START.

Further advantages and features of the present invention are shown inthe specification and in the accompanying drawings, in which:

FIG. 1 shows a circuit diagram showing the control circuit of theinvention;

FIG. 2, the circuit diagram after starting the ilow with the startedmotor;

FIG. 3, the circuit diagram in the unbraked state of the loom with theclutch engaged during manual movement of the loom;

FIG. 4, the circuit diagram during returning the batten to the rear deadcentre;

FIG. 5, a diagram showing the circuit of the motor driving the loom; and

FIG. 6, the circuit diagram of FIG 1 combined with a fragmentaryperspective View of the loom, and illustrating the electricalconnections between the control circuit and the loom.

The shown diagrams are provided on the left side with a column ofnumbers, marking the diagram lines one to seven. On the right side ofthe diagrams, certain lines are provided with numbers having a bareither above or below them. The latter numbers show, that in this lineeither a relay or another switch control means is operat'ive for closingor opening in the line of the diagram marked by this number contactsmarked with the same reference character as the corresponding relay orcontrol means, plus a subscript. Closing is marked by the bar above thenumber, opening by the bar below the number.

FIG. 5 shows the drive motor 6 of the loom connected with a primary ACvoltage source U4 by contacts Sie for forward rotation, by reversingcontacts 82e, and main switch P.

Voltage source U4 is connected to the primary winding of a transformer Twhose secondary winding is tapped and connected with rectifying diodes Dto produce DC voltages U1 and U2, and an AC voltage U3.

FIGS. 1 and 6 also show thecommon terminal 'Ub -U2, -U3, terminals-i-Ul, |-U2, and the second AC terminal -U3. The DC voltage U2 isgreater than the DC voltage U1.

Referring now to the circuit diagrams of FIGS. 1 to 4 and 6, in thefirst line, from left to right, are a condenser C1, contacts Rm of arelay R1 in line one, contacts ZU of a weft stop motion 1, contacts ZOof a warp stop motion 2, contacts ZSL and ZSP of the left and right stopmotions 3 and 4 respectively for checking the weft inserter 5, forexample a gripper shuttle, an auxiliary normally closed contact S22, ofa contactor S2 in line seven, contacts TS of a STOP pushbutton forstopping the loom, but not the motor of the loom, contacts TR,1 of a RE-VERSE pushbutton, serving for returning the sley 7 to its rear deadcenter position, and the relay R1. In the second line of the circuitdiagram of FIGS. 1 and 6, there are: contacts TA of a START pushbuttonserving for releasing the brake of the loom and for actuating a clutch 8connecting drive motor -6 with the loom, contacts Kzo of a positionswitch 9 control'led by a cam 16, and release contacts TMa of a MOTORpushbutton. In the third line there are: two switch contacts S21, andS2c of the contactor S2 in line seven, contacts K of a position switchcontrolled by a cam 15, an auxiliary normally closed contact S1,L of acontactor S1 in line 6 and an electromagnet M which controls the clutch8 of the loom. The movable clutch part serves simultaneously as a brakewhen disengaged from the drive motor 6. In the fourth line there are:condensers C2 and C3 serving for a quick absorption of theelectromagnetic energy being released by the electromagnet M uponinterruption of circuits so that scorching of the contacts is avoided.Between the fourth and fifth line there is the second terminal -U3 ofthe source of an alternating voltage. In the fth line of FIG. 6 thereare: switch contacts TMb of the MOTOR pushbutton in line two, a relay R2and contacts RT of a thermal relay 11, serving for the protection of amotor 6 from excessive currents, multiple main contacts S1c of contactorS1 in line six for the forward rotation of motor 6, see also FIG. 5. Inthe sixth line of FIG. 6 there are: contacts R22 of the relay R2 in linefive, contacts TR,o of the REVERSE pushbutton in line one. Contacts S2dare auxiliary normally closed contacts of the contactor S2 in lineseven. Contacts 82e, see FIG. 6, are multiple main switch contacts ofthe contactor S2 in line seven, see also FIG. 5. In the seventh line ofFIG. 6 there are: switch contacts TRc of the REVERSE pushbutton,auxiliary normally closed contacts S11, of the contactor S1 in line six,contactor S2 for causing reverse rotation of motor 6 for returning thesley 7 into its back position, and in FIG. 6 switch contacts P of a mainswitch 12 which close the main circuit of the motor 6.

The auxiliary contacts S211, S11, prevent the contactors S1 and S2 frombeing simultaneously energized.

The voltage -U1, -l-U1 which is lower than voltage -U2, .Lf-U2 serves asa holding voltage and is just suicient to hold by electromagnet M theclutch 8 in a closed position. The motor 6 is mounted on the loom and isinterconnected with the main shaft of the loom by means of a belt driveand an electromagnetic clutch 8, the latter engaging a brake member forbraking the loom when disengaged from the motor.

As shown in FIG. 5, motor 6 is connected to the main source of Voltage-U4 and for the forward run is switched by the main contacts S1c of thecontactor S1 in line six of the wiring diagram in FIG. 6.

The reverse running of the motor 6 is brought about by changing thephases of the main leads of motor 6 by the main contacts S2e of thecontactor S2 in line seven of the wiring diagram in FIG. 7.

A complete disconnection of the motor 6 from the main voltage U4 iseffected by operation of the main switch handle 12, the contacts P ofwhich are shown in FIGS. 5 and 6.

FIG. 6 shows a diagrammatic representation of the clutch 8 which iscontrolled by the electromagnet M. The clutch 8 serves simultaneously asa brake at the time when the electromagnet M is deenergized. It onlybrakes the moving mechanisms of the loom, not motor 6. When theelectromagnet M is energized the clutch 8 releases the machine brake andso connects motor 6 with the loom.

For turning the machine manually, there is a hand wheel 14 disposed onthe main shaft 13. This hand Iwheel can be rotated only when the STARTpushbutton is depressed and at the time when the motor 6 is at rest. Bydepressing the START pushbutton the circuit of the electromagnet M ofthe clutch 8 is interconnected and the brake 'is released, so that theloom may be turned manually.

The position switches 10, 9 are operated by cams on main shaft 13, asshown in FIG. 6. The function of these position switches is thefollowing one: For example, if the normally operating loom has to bestopped, the contacts TS are opened by depressing the STOP pushbutton.These contacts, however, are bridged by the contacts K of positionswitch 10 and are opened only when the sley 7 reaches its rear deadcenter position, the effect being obtained by angularly setting a cam=15 on the main shaft 13, cam 10 controlling the contacts K of theposition switch 10. The circuit interruption results in an immediatestopping of the loom inthe dead center position.

Similarly, when the machine is to be turned forward one revolution byusing motor 6, the position switch 10 is utilized as follows: ondepressing the START pushbutton the machine begins to start from therear dead center position of the sley 7 and immediately thereafter theSTOP pushbutton is to be depressed, however, the circuit is notinterrupted since the contacts TS of the STOP pushbutton are bridged bythe contacts K of the position switch 10, the said contacts being openedonly at the moment when the sley 7 reaches again its rear dead centerposition. In this case the position switch 10 is again opened by therespective cam 15 turning with the main shaft 13. In this case, too, itis necessary to hold down the STOP pushbutton until the machine comes toa complete stop.

For reversing the machine one revolution in order to remove a brokenweft thread or in the case that the shuttle does not enter the shuttlebox properly, the function of the position switch 10 (collector) isanalogous as in the case of turning the main loom shaft one revolution,forwardly.

When the warp stop motion 2 is actuated and interrupts the circuit, theposition switch 9 becomes effective, which bridges the contacts ZO ofthe warp stop motion 2.

The position switch 9 is controlled by a cam 16 disposed on the rnainloom shaft 13 and its contacts Kzo are opened just at a moment at whichthe heddles or heald shafts, not shown, are aligned in a position inwhich the warps are located in a common plane, for example when a brokenwarp end is to be removed.

From the function of the position switch 9, it follows that when thewarp stop motion 2 interrupts the circuit at any moment, the loom is notstopped at once, but it continues to run until the cam 16 causes openingof position switch 9, the contacts Kzo of which bridge the contacts ZOof the warp stop motion 2, whereafter the cam controlled position switch9 interrupts the circuit of the electromagnet M, resulting in animmediate stopping of the machine. Upon an increased electrical input inthe motor circuit of FIG. 5 into which the thermal relay 11 isconnected, the contacts RT of the thermal relay 11, see FIG. 6, areopened whereby the danger of damage to circuit parts is eliminated.

As shown in FIG. 5 main contacts S1., (FIGS. S and 6) interconnect themain circuit of the motor 6 for forward running. These contacts S1c arecontrolled by the contactor S1. The contactor S2 controls the maincontacts S2c for a reverse running of the motor.

In FIG. 6 both the left hand stop motion 3 and the right hand stopmotion 4 controlled by the weft inserter 5, for example a grippershuttle, are diagrammatically represented, connected with thecorresponding contacts ZS1I and ZSP respectively.

The normally closed contacts S1a of the contactor S1 bridges both thecontacts ZU of the weft stop motion -1 and the contacts ZO of the warpstop motion 2, in order to keep the circuit of the voltage -U1, |U1closed even when the contacts ZU and ZO of the stop motions 3, 4 areopened. The contacts ZSL of the left hand stop motion 3 and the contactsZSP of the right hand stop motion 4 of the weft inserter 5 are notbridged by this contact S12 in order to enable checking the correctsetting of the loom by turning the machine manually by the hand wheel14.

To attain this, first of al1 the motor 6 must be cut olf, but theelectromagnet M of the clutch 8 must be energized. To close theelectromagnet M of the clutch 8, the START pushbutton is used whichcloses the circuit of voltage -U2, '-i-Uz across the electromagnet M andin the second branch across the relay R1 whose contact Rh,L closes thecircuit of the voltage -U1, +U1. Thereby the electromagnet M ispermanently connected to the Voltage -U1, '-t-UZ, and brake-clutch 8 isreleased so that the loom can be manually turned for setting it andchecking.

While the motor 6 is running, the resting contact S1, of the contactorS1 is cut olf, so that the circuit of the voltage U1, '+U1 is now beingclosed by both the contacts ZU of the weft stop motion 1 and thecontacts ZO of the warp stop motion 2, which were bridged up to now bythe resting contact 81,1.

IIn order to fulfill all requirements enumerated in the introduction,the following operations are to be carried out:

Starting the motor (FIG. 2).

Unbreaking the loom and engaging the clutch.

While the motor 6 is out of action, loom is manually turned foradjustment (FIG. 3).

Forward running of the motor when (a) the loom is running continuously,(b) the looms is to be turned for one revolution forwards.

After reversing the turning direction of the motor for returning thebatten into its rear dead centre (FIG. 4):

(a) correction a weft breakage,

(b) stopping the loom because of the weft inserter malfunction in whichcase the batten is to be returned to its rear dead centre, the inserterput into its correct position and the loom started from the rear deadcentre of the batten.

Starting the motor (FIG. 2): The pushbutton MOTOR of contacts TMa, TMbserves for starting the motor, the disconnecting contacts TMa of saidpushbutton being situated in the second and the connecting contacts TM]Din the fifth line. The disconnecting contacts of the pushbutton MOTOR inthe second line disconnect at rst for safety reason the circuit of themagnet M, which can be connected even during stoppage of the motor bypressing down pushbutton START either by mistake or during adjustment ofthe machine. The connecting contacts of the pushbutton MOTOR in thefifth line close the AC circuit U3 (dashed lines). The circuit has twobranches. The first one goes on the sixth line over the contacts TR1J ofpushbutton REVERSE, the auxiliary rest contacts 82.1, S2 and thecontactor coil S1, the second branch on the fifth line runs over relayR2 and after connecting` the two branches by means of the thermal relayswitch RT on the fth line, the circuit is closed to the second ACterminal U3. The main contacts S1c of contacto-r S1 connect the motorwith the main voltage U4 and the contacts of relay R2 in line sixconnect permanently the AC circuit, this enabling the release of thepushbutton MOTOR. The circuit closed in this way is shown in FIG. 2(thick lines), and the connected contactor S2 disconnects the -auxiliarycontacts 81 in line three, -said contacts being unable to arch over thecontacts of the warp and weft stop motions ZO and Z in line one. Themotor stoppage is effected by the main current switch 121P or by apushbutton 11 of the thermal relay RT in the fifth line.

The lunbraking and the engagement of the clutch for turning the loomduring manual -setting and adjustment with the stopped motor is shown inBIG. 3. By pressing down the pushbutton START, the DC voltage circuit+U2 is closed by contacts 'IA, as shown in FIG. 3 is dashed lines, thenin line one over the contacts ZSL of the left and right weft inserterchecking stop motion, the

auxiliary rest contacts 82 of contactor S2, over the contacts TS of thepushbutton STOP, over the contacts M1, of the pushbutton MOTOR in thesecond line, where said circuit is divided into two branches. The branchin the third line is closed by ythe electromagnet M, which controls theunbraking action of the loom and the clutch engagement, the branch inthe first line running over the contacts TRa of the pushbutton REVERSEand the winding of relay R1. Afterwards, the two branches are connected,closing the circuit at the common terminal -U1, -U2, U3.

'Ilhe contact Rm of relay R1 in line one connects the circuit to theworking voltage |U1. The rest contact S15 of contactor S1 in the thirdline interconnects either all or only certain stop motion circuits insuch a way that the circuit is closed even when the stop motions aredisconnected. In the example shown only weft motion contacts Z and warpstop motion contacts ZO are bridged. The stop motions contacts ZSL and251, controlling the weft inserter are not bridged by this contact 81a,as during manual turning of the loom, their correct adjustment can becarried ont and checked. Moreover, the circuit is closed over ZSP andZSL, Sac, etc., as s'hown in the circuit diagram.

In this Way, the circuit is permanently connected to voltage +U1 andpushbutton START can be released. This condition is shown in FIG. 3 inheavy lines. Since during unbraking the loom and engaging the clutch,the armature of the electromagnet M must close an air gap, voltage -l-Uzis higher than voltage -l-U1, the latter maintaining said armature afterclosing said air gap only in the connected position. Between theterminals -I-UZ and -t-U1 no short circuit can take place, :as thesource of these voltages is transformer T rectifying voltages U1 and U2in a conventional manner by means of diodes D, as shown in lFIG. 5.Further, FIG. 3 shows that all stop contacts,`i.e. the warp stop motioncontacts ZO, the weft lstop motion contacts Z and the gripper shuttle orweft inserter stop motion contacts ZS, must be in the connected state,otherwise the loom can be turned, or shifted manually only when pressingdown pushbutton START, in the case of a disconnected warp stop motion orweft stop motion.

Braking of the loom and engagement of the clutch during the normal runof the loom (FIG. 1 and FIG. 6) is carried out, as follows:

After starting the motor by pushing down pushbutton MOTOR, the loom isstarted by pressing down pushbutton START, in which case the connectionof the circuit takes place as already specied above with the onlydifference, that the contacts S1a in line three are disconnected and thecircuit of voltage -l-U1 must be closed over the contacts Z0 and Z ofthe weft and warp stop motions.

Stoppage of the loom is then possible in the following manner:

(l) By pressing down pushbutton STOP.

In this case, the circuit is not immediately interrupted as it is stillclosed over the contacts of the end contactor K in line three openingthe circuit only when fthe batteri is in its rear dead centre, wherebythe revolution is finished. The interruption of the circuit brings aboutthe immediate loom stoppage.

(2) In the case that the circuit is interrupted by any of the controldevices.

The weft stop motion Z disconnects the circuit and stops the loom inaposition, in which the batten is 4before the beat-up. The gripperchecking device ZSL and ZSP stops the machine in the case of failurealso in a position in which the batten B is before the beat-up. The warpstop motion contacts ZO disconnects the circuit at an arbitrary moment,however, said stop motion contacts are bridged by the contactors KZO ofposition switch 9 which stop the loom in the level position of 'theheald shafts 7 (i.e. in the position in which a broken warp yarn isremoved).

From the diagram in FIG. 1 can be seen that the loom can be started evenwhen the warp stop motion 2 or weft stop motion 3 is disconnected. Thisis necessary if the warp stop motions 2 are in action not because ofbreakage, but because of slackened warp yarns. In that case the loom isin action only when the pushbutton START is pressed down.

Turning the loom for one revolution is carried out, as follows:

By pressing down the pushbutton START the loom is started from the reardead center position of the batten B. By pressing down the pushbuttonSTOP, the circuit is closed again over the contacts K and the loomfinishes the revolution at the rear dead centre of the batten, at whichmoment the circuit is disconnected the contacts K of the cam controlledswitch 10.

Returning the batten B from the position before the beat-up to the reardead center position (FIG. 4) is carried out as follows:

IBy pressing down the pushbutton REVERSE, the relay R1 is disconnectedby contacts TRa from the circuit in the first line, and in the sixthline the circuit branch of contactor S1 is disconnected by contacts TRb,whereby the motor 6 is disconnected by contacts S1c from the voltage U4,see FIG. 5. At the same time, the disconnected contactor S1 connects theauxiliary rest contacts Slb in line seven of the circuit branch withcontactor S2. The connection of this circuit branch is nished by thecontacts TRc of the pushbutton IREVERSE in line Seven.

The contactor S2 connects the motor with the voltage U4 by contacts S2ein such a way, that said motor rotates in the opposite sense as long asthe pushbutton REVERSE is -pressed down. Simultaneously, the auxiliarycontacts S21, of contactor S2 in line three connect the terminal -l-U2over contacts K of cam controlled switch 10 and the circuit is furtherclosed over the contacts of the pushbutton MOTOR and the electromagnet Mto the terminal -U2. The elcctromagnet M causes braking of the loom andengages the clutch 8. The loom starts running in the reversed sense. Thecontact K of switch 10 interrupts the circuit and stops the loom, assoon as the batten reaches the rear dead center position. The motor `6,however, runs still in the reversed sense as long as the pushbuttonREVERSE is pressed down. As soon as the pushbutton REVERSE is released,its contacts TR in line seven interrupt the circuit of contactor S2, themotor is disconnected from voltage U4 and in line six the contacts TR1,of pushbutton REVERSE are re-established. By means of the auxiliary restcontacts 52d, the circuit of contactor S1 is closed for connecting themotor with voltage U4 by contacts Slc for rotation in the original senseof rotation. The motor is running, but, the loom does not run and afterremoving the cause of a malfunction (misrun of the gripper or yarnbreakage) said loorn can be started Iby the pushbutton START in linetwo.

There is still to be explained, why the relay R1 must be disconnectedfrom the lcircuit by means of the TRa of pushbutton REVERSE in line one,even when the contactor S2 in line seven is energized and its auxiliaryrest contacts 82a in line one the circuit over the switch 10, K afterthe batten has reached its rear dead center position, and the contactsRm in line one would be opened by interruption of the circuit. In thecase, that the attendant would not hold down the pushbutton RE- VERSEuntil the batten B stops in its dead center position so that the relayR1 in line one would hold the contacts RM, in line one closed, thecurrent from terminal -i-U1 would immediately start the loom to runforwards. The loom would, however, be again stopped by the stop motionthat was in operative before, and the return action would have to berepeated.

From the description of the operations of the invention it is obvious,that for meeting all requirements laid upon by the weaving technology,only three pushbuttons are suicient, i.e. pushbuttons START, STOP andREVERSE. By pressing down the pushbutton START the loom is started, bypressing down the pushbutton STOP the loom is stopped, but not themotor. By successively pressing down the pushbuttons START and STOP theloom shaft can be turned for one revolution corresponding to one pick.If the loom is stopped by a control device (warp or weft stop motion, orgripper shuttle stop motion device) i.e. in a position in which thebatten B approaches the beat-up position, the batten can be returned tothe rear position by pressing down the push-button RE- VERSE.

The fourth pushbutton MOTOR is used normally only at the beginning of ashift and can be therefore mounted outside the control panel, e.g. onthe housing H of the electric wiring of the circuit shown in FIG. 1, onwhich also the pushbutton of the thermal relay RT and the main switch12, P are situated. Stoppage of the motor can Vbe obtained by pressingdown the pushbutton RT or by switching olf the main switch 12, P. On thecontrol panel of the loorn, there are for the sake of simplicity onlythree pushbuttons.

What is claimed is:

1. Control apparatus for a loom, comprising in combination, controlcircuit means including manual start contacts, manual stop contacts, andmanual reversing contacts for starting, stopping and reversing the loom,respectively; a irst source of a higher voltage and a second source of alower voltage, said [first voltage source being connected with saidcontrol circuit means when said start contacts and reversing contactsare manually closed, respectively; said control circuit means includingcontact means for disconnecting said trst voltage source and forconnecting said second voltage source with said control circuit uponmanual release of said start contacts so that said control circuit isenergized by a lower voltage during normal forward operations of theloom than during starting and reversed motion of the loom.

2. Control apparatus for a loom as claimed in claim 1 comprising a startpushbutton for operating said start contacts, a stop pushbutton foroperating said stop contacts, and a reverse pushbutton for operatingsaid reversing contacts.

3. Control apparatus as claimed in claim 1 wherein said loom comprises aweft stop motion including contacts for disconnecting said secondvoltage source from said weft stop motion for causing stopping of theloom upon a weft thread breakage at the beginning or during the pick ofthe lweft thread and before the weaving of the weft thread into thewarps.

4. Control apparatus as claimed in claim 1 wherein said loom has a weftinserting device, a first stop motion for the same, and other stopmotions; wherein said control circuit includes means for connecting saidfirst stop motion to both said first and second voltages during forwardrunning of the loom and for connecting the other stop motions only tothe second voltage source whereby said first stop motion is operativeAwhen said start contacts are held closed; and means for disconnectingall stop motions from said voltage sources upon operation of saidreversing contacts.

5. Control apparatus as claimed in claim 4 wherein said control circuitincludes a position switch actuated in one position of said loom,wherein said other stop motions include a warp stop motion havingcontacts bridged by said position switch in a position of said loom inwhich a warp thread can be threaded into the loom so that the actuatedwarp stop motion stops the loom in said threading position.

6. Control apparatus as claimed in claim 4 wherein said dirst stopmotion of said weft inserter device has contact means for disconnectingthe circuits of said rst and second voltage sources when said weftinserting device is in an incorrect position and causes stopping of theloom before the beat-up of the weft thread so that thel loom can not bestarted before the position of said weft inserting device is corrected.

7. Control apparatus as claimed in claim 4 wherein said other stopmotions include a warp stop motion and a weft stop motion respectivelyhaving warp stop motion contacts and weft stop motion contacts which areconnected with said irst voltage source by a first circuit part, saidrst voltage source having another circuit part connected with said startcontacts, and comprising a position switch opened by said loorn in therear dead center position of the same and bridging said s-top contactswhen closed so that when said start contacts and stop contacts aresuccessively closed, the loom turns one revolution from one rear deadcenter position to the following rear dead center position.

8. Control appara-tus as claimed in claim 7 comprising a motor fordriving the loom; wherein said control circuit comprises relay meanscontrolled by said reverse contacts and first relay contacts operated bysaid relay 4means and located in the circuit of said motor for re- 20versing the direction of rota-tion of the same upon operation of saidreverse contacts; and including other relay contacts cooperating withsaid position switch so that said rst voltage source is disconnected insaid rear dead center position of said loom whereby the reverse rotationof said loom is stopped at the rear dead center position of the same.

9. Control circuit as claimed in claim 8 wherein said circuit meansinclude contact means for bridging the contacts of said warp stop motionand said weft stop motion so that the same are rendered inoperative whensaid motor is stopped; and comprising means for manually turning saidloom in both directions of rotation for setting and adjustment of theloom after actuation of said start contacts.

10. Control apparatus as claimed in claim 1 including a motor and aclutch connecting said motor with said loom; wherein said controlcircuit includes an electromagnet for operating said clutch, and motorswitch means for starting said motor and including contacts fordisconnecting said electromagnet so that said clutch cannot be engagedduring starting acceleration of said motor.

References Cited UNITED STATES PATENTS 2,148,700 2/1939 Lohsse 139--3362,600,667 6/1952 Mason 139-1.4 2,805,686 9/1957 Godschalx 139-142,810,402 10/ 1957 Godschalx 139-1.4

HENRY S. JAUDON, Primary Examiner.

U.S. Cl. X.R.

